Investment in Cenovus Energy (Tables) - Cenovus Energy Inc [Member]

12 Months Ended

Dec. 31, 2021

Schedule Of Available For Sale Securities [Line Items]

Schedule of Investment in Common Shares Carried at Fair Value

December 31

2021

2020

Number of shares of CVE common stock (millions)

91

208

Ownership of issued and outstanding common stock

4.5

%

16.9

Closing price on NYSE on last trading day ($/share)

$

12.28

6.04

Fair Value (millions of dollars)

$

1,117

1,256

Gains and Losses Recorded in Other Income (Loss)

Millions of Dollars

2021

2020

2019

Total Net gain (loss) on equity securities

$

1,040

(855)

649

Less: Net gain (loss) on equity securities sold during the period

473

Unrealized gain (loss) on equity securities still held at

 the reporting date

$

567

(855)

649